Extraction and drying device



1951 E. RICKERT 2,539,702

EXTRACTION AND DRYING DEVICE Filed Feb. 13, 1946 L512 1) ezzrtol E, ZQCKCZDZJ:

Patented Jan. 30, 1951 Eduard Rickert, Zurich, Switzerland Application February 13, 1946, Serial -No.,647.,336 In Switzerland February 8, 1945 .4 Claims.

Industrial extraction and drying processes, particularly those concerned with fine, granular materials are finding an increasing number of rotary machines at their disposal. The basis of those constructions is generally a horizontally journalled drum fitted with an outer jacket for heating and suitable openings or man-holes for filling and emptying purposes.

All such designs up to the present may be observed to suffer from one .particular drawback especially when the drum is .well filled namely that movement between the particles of the :material only takes place near the periphery of the filling where a sliding action occurs. There is however a large relatively static zone formed which simply rotates with the machine.

Under these conditions it is impossible for the solvents (extracting fluids) to penetrate uniformly the materials under treatment. In the same manner the drying process is greatly retarded due to the decreased rate of heat transmission to the core of the material.

A further inconvenience experienced is that heterogeneous materials gradually separate during the process, the fine grains moving towards the centre and the coarser particles accumulating in the outer zone.

Thus from the above statement it may be seen that such a method of operation does not assure a uniform treatment of the material under process.

Designs have been proposed with the intention of obtaining the above effects but in practice the results have not proved satisfactory, the static zone or core remaining unaffected.

There are very definite limitations insofar as the construction of fittings inside the rotating drum is concerned. In the first place the charging and discharging conditions must be satisfactory. The vessel must also be entered from time to time for cleaning and repairs. It is equally important to ensure that the free circulation of liquids and vapours is in no way hindered and that no dead spaces arise.

The object of the present invention is to provide a new construction which will fully satisfy all the requirements set forth above and thus considerably improve the extracting and the drying processes.

For this purpose partitioning walls extending over the full length and breadth are arranged inside the drum which by the rotation of the machine bring about a displacement of the material in such a way as to avoid the formation of a stagnant zone.

The embodiment of .myinvention is diagram.- matically shown in the accompanying drawing, in .which Fig. 1 is a longitudinalsection, and

Fig. 2 is ,a cross-section through 11-11 of my apparatus.

Referring now more particularly to the accompanying drawings in whichsimilar characters .of reference designate corresponding parts, there is provided a rotatably .mounted drum 3 having a double jacket li,.the drum being journalledina pair of bearings 2 by means of hollow trunnions I. The interior .of chamber 5 .of the drum for the reception of the material to be treated is accessible by means of a manhole 6 provided with a cover I. In the chamber 5 there is arranged a heating medium inlet conduit 8 which extends substantially throughout the length of the drum and has the outer end closed. A plurality of heat conducting pipes extend radially from the conduit 8 and are in communication with each other at their outer ends. These pipes 9 are all arranged in the same plane passing through the axis of the drum and form an apertured partition for dividing the drum into two substantiall equal compartments.- The partition may include perforated sections I2 arranged in the apertures or spaces II! between the pipes 9.

The double jacket hollow space is connected by pipes I3 to the heat conducting pipes 9 and thus to the conduit 8 so that any heating medium such as steam or the like flowing through the reduced inlet tube I4 in the hollow trunnion I, the conduit 8 and from there by way of pipes 9 into the double jacket hollow space discharges, together with any :water of condensation by means of a discharge pipe or tube I5.

Sieve-plates I6 are secured to the walls of the inner jacket of the drum. Treating means are introduced through the pipes I1 and I8 of the material to be treated, and the treating means maybe discharged through the pipes I9 and 20. Said treating means may overflow through the perforations in the sieve-plates into the drum plates.

In carrying out drying processes the developing vapours may escape through the said sieveplates and said range of pipes connected thereto.

What I claim is:

1. An extraction and drying device, including a rotatably mounted and horizontally disposed drum having a jacket thereabout, a heating medium inlet conduit arranged centrally of the drum and extending substantially throughout the length thereof and closed at the outer end, a

plurality of heat conducting pipes radiating from the conduit and in communication with each other at their outer ends, at least one of the pipes being connected to and arranged in communication with the jacket of the drum in order that the pipes will rotate with the drum, all of the pipes being arranged in the same plane passing through the axis of the drum to provide an apertured partition for dividing the drum into two equal compartments, means for discharging the heating medium from the jacket through one end of the drum, and means at the other end of the drum for injecting treating material into and discharging the same from the drum.

2. An extraction and drying device as claimed in claim 1, in which reticulated plates are arranged between the radiating pipes and in the same plane as the partition formed thereby.

3. An extraction and drying device including a rotatably mounted and horizontally disposed drum having a jacket thereabout, a hollow inlet conduit arranged centrally of the drum for conducting a heating medium thereinto, said conduit extending substantially throughout the length of the drum and having the outer end closed, a plurality of heat conducting pipes radiating from the conduit and in communication with each other at the outer ends, at least one of the pipes being connected to and in communication with the jacket of the drum in order that the pipes will rotate with the drum, all of the pipes being arranged in the same plane passing through the axis of the drum to provide a par- 4 tition for dividing the drum into two substatitially equal compartments, the partition including perforated sections arranged between and in the plane of the pipes, a heating medium discharge pipe arranged concentrically about the inlet conduit and also rotating with the drum, a tube leading from the discharge pipe and in communication with the jacket, and means for supplying and exhausting treatment materials to the drum adjacent the outer closed end of the inlet conduit.

4. An extraction and drying device as claimed in claim 3, in which the means for supplying and exhausting treatment materials include concentrically arranged pipes which extend into the drum and have branches thereof arranged at opposite sides of the drum and at substantially 90 with respect to the heat conducting pipes, said last mentioned pipes also rotating with the drum.

EDUARD RICKERT.

REFERENCES CITED The following references are of record in the file of this patent: V

UNITED STATES PA'IENTS Number Name Date 148,806 Brundred Mar. 24,1874 230,303 Marsh July 20, 1880 308,529 rStollwerck Nov. 25, 1884 1,807,232 Wurster May 26, 1931 2,370,614 Bohm Mar. 6, 1945 

